Ear plug



FIG. 1 is a top plan view of an ear plug of the present invention;

FIG. 2 is an elevation thereof, all elevation views being identical;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a front perspective view thereof.

The broken lines shown in the drawings are for environmental purposes only and form no part of the claimed design. 

The ornamental design for an ear plug, as shown and described. 